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Authors Masiewicz, E. ; Grzybowski, A. ; Grzybowska, K. ; Pawlus, S. ; Pionteck, J. ; Paluch, M.
Title Adam-Gibbs model in the density scaling regime and its implications for the configurational entropy scaling
Date 14.09.2015
Number 45923
Abstract To solve a long-standing problem of condensed matter physics with determining a proper description of the thermodynamic evolution of the time scale of molecular dynamics near the glass transition, we extend the well-known Adam-Gibbs model to describe the temperature-volume dependence of structural relaxation times, ta(T,V). We employ the thermodynamic scaling idea reflected in the density scaling power law, ta=f(T-1V-·), recently acknowledged as a valid unifying concept in the glass transition physics, to discriminate between physically relevant and irrelevant attempts at formulating the temperature-volume representations of the Adam-Gibbs model. As a consequence, we determine a straightforward relation between the structural relaxation time ta and the configurational entropy Sc, giving evidence that also Sc(T,V)=g(T-1V-·) with the exponent {gamma} that enables to scale ta(T,V). This important finding has meaningful implications for the linkage between thermodynamics and molecular dynamics near the glass transition, because it implies that ta can be scaled with Sc.
Publisher Scientific Reports
Wikidata
Citation Scientific Reports 5 (2015) 13 p.
DOI https://doi.org/10.1038/srep13998
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